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The budget would reduce spending National Forest land acquisition, rural water infrastructure and statistical capabilities at the department. It also proposes reduced staff in county USDA offices, an idea that fell flat in Congress when Barack Obama proposed a similar reduction.

The overall numbers: The budget proposes department discretionary spending of $17.9 billion, down $4.7 billion from last year's enacted amount. That doesn't count entitlement programs such as food stamps, which make up the bulk of the Agriculture Department's budget.

Spending that needs Congress' annual approval: $17.9 billion

DEFENSE DEPARTMENT

Up about 10 percent.

Highlight:

The numbers: Base budget of $574 billion to operate the department, plus $65 billion in war funds, for a total budget of $639 billion.

Total spending: $639 billion.

Spending that needs Congress' annual approval: $639 billion.

DEPARTMENT OF EDUCATION

Down 13.5 percent

Highlight:

The proposed budget would slash department funding by $9.2 billion from this year's $68.2 billion, a major cut unseen in recent years. The administration is proposing to allocate an additional $1.4 billion for school choice programs and to eliminate two programs worth $3.6 billion that provide funding for teacher preparation and after-school programs, among other plans.

The numbers: $59 billion, down $9.2 billion from 2017.

Spending that needs Congress' annual approval: $59 billion

DEPARTMENT OF ENERGY

Down 5.6 percent

Highlight:

The budget slashes $700 million from an Energy Department office that promotes energy efficiency and renewable energy and eliminates the Office of Science and the Advanced Research Projects Agency-Energy (ARPA-E), which supports research into new energy technologies.

The numbers: $28 billion, including $13.9 billion for the NNSA and $14.1 billion for all other energy programs.

Spending that needs Congress' annual approval: $28 billion.

ENVIRONMENTAL PROTECTION AGENCY

Down 31.4 percent

Highlight:

Trump's proposal would slash spending for environmental protection by nearly $2.6 billion, or 31 percent, one of the biggest cuts in the president's budget. More than 3,000 EPA workers would lose their jobs, and programs such as Obama's Clean Power Plan — which would tighten regulations on emissions from coal-fired power plants that contribute to global warming — would be eliminated.

Spending that needs Congress' annual approval: $5.7 billion

HEALTH AND HUMAN SERVICES

Down 16.2 percent

Highlight:

The budget plan would cut $5.8 billion from the nearly $32 billion National Institutes of Health, the nation's premier medical research agency, or roughly 18 percent.

The numbers: The budget calls for discretionary spending of $65.1 billion, down $12.6 billion from 2017. That doesn't address entitlement programs like Medicare and Medicaid, which make up the vast majority of HHS spending. The budget also calls for spending of $1.1 billion on FDA drug review under the 21st Century CURES Act, and $400 million on efforts to stem waste, fraud and abuse.

Spending that needs Congress' annual approval: $66.6 billion

HOMELAND SECURITY DEPARTMENT

Up 6.8 percent

Highlight: President Trump's budget asks for a total increase of about $2.8 billion. That includes a request for $2.6 billion to start Trump's much promised border wall, though he has said Mexico will eventually pay for the barrier. Mexico has repeatedly rejected any such suggestion.

The Numbers: $44.1 billion, up $2.8 billion from 2017

Spending that needs Congress' annual approval: $44.1 billion

DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT

Down 13.2 percent

Highlight:

The budget would eliminate the Community Development Block Grant program, a $3 billion effort that funds local improvement efforts. Mayors, city officials and housing advocates say the grants provide critical money to communities for infrastructure improvements for seniors, open space projects in poor neighborhoods, and social service programs such as Boys and Girls Clubs.

Spending that needs Congress' annual approval: $40.7 billion

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

Down 0.8 percent

Highlight:

Eliminates Obama's asteroid redirect mission that would have used a robotic probe to grab a chunk of an asteroid, bring it close to the moon and then send astronauts to explore it. Also cuts the $115 million NASA education program and four Earth science missions that look at climate change, solar storms and ocean health.

The numbers: $19.1 billion, down around $200 million from 2017.

Spending that needs Congress' annual approval: $19.1 billion.

DEPARTMENT OF LABOR

Down 20.7 percent.

Highlight:

Though Trump has said he'd advocate for U.S. workers, his budget includes cuts to several programs. It would eliminate the $434 million Senior Community Service Employment Program, which, according to the Labor Department website, has helped more than 1 million Americans over age 55 find work.

The numbers: Trump is proposing spending $9.6 billion in 2018, down $2.5 billion from the fiscal 2017 level.

Spending that needs Congress' annual approval: $9.6 billion

STATE DEPARTMENT

Down 28.7 percent.

Highlights:

Reduces funding to the United Nations and its affiliated agencies, and caps American contributions to U.N. peacekeeping missions at 25 percent of the total costs.

The numbers: $37.6 billion. It's split between $25.6 billion in "base funding" for regular programs and $12 billion for "overseas contingency operations," a wartime account that covers operations in places like Iraq, Afghanistan and Syria. USAID funding is included in the base funding.

Spending that needs Congress' annual approval: $37.6 billion.

DEPARTMENT OF TRANSPORTATION

Down 12.7 percent

Highlight:

— Calls for taking responsibility for air traffic control operations away from the Federal Aviation Administration and giving it to a "non-governmental organization," most likely a nonprofit corporation. Airlines, which would have seats on the corporation's board, have made air traffic control privatization a top priority.

The numbers: $16.2 billion, down $2.4 billion from 2017.

Spending that needs Congress' annual approval: $16.2 billion

TREASURY DEPARTMENT

Down 4.4 percent

Highlight:

—After years of budget cuts, the IRS budget would be reduced again, by $239 million from this year. The IRS budget is down about $1 billion from its height in 2010. Since then, the agency has lost more than 17,000 employees. As a result, the chances of getting audited have rarely been so low.